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Cam selection
Friend has a 62 Chevy PU rat rod he mainly uses to pull car trailer. It now has a 400 small block but he wants to build a big block for it. His current cruising rpm is around 2000-2100 rpm with his gearing and needs to have power in that range not to be downshifting on hills. Looking for a good lumpy cam that still has some power in that range. Engine will be a 9-1 460 with 781 heads, big valves. performer intake, and 850 Holley. He's looking at the Howards 120241-09. Any suggestion for a good sounding cam that makes power in that range?
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Senior Tech Team
jeff
Join Date: Jan 2008
Location: yukon ok.
Posts: 4,903
Re: Cam selection
Wants a lumpy cam and power in the very low 2000 rpm range for trailer towing.
To me that is just a horrible idea.
It is very hard on bearings to pull an engine down to 2000 rpm under a load.
Lumpy cams do not really get into a good cruise set until 500 or more rpm than what you have listed.
Yes you can get by with it but to me it would not be optimum.
I would do a much smaller grind for that RPM something like [email protected] .050 want it to lump a bit then go for a 108 or 106LSA with that duration.
For my towing stuff I like to be in the 2500 rpm minimum area and usually 2800 makes it really sweet with good power and velocity gets up a bit more through the runners and MPG does very well, better than at 2000 rpm.
But I base this on smaller engines than 460"
I did build an 11:1 396 with .060 over bore and large oval heads 2.19-1.88 valves I stuck a [email protected] .050 cam in it with 108LSA and it really is lumpy and pulls very well ..buddy had it in a 3/4 ton truck with 456 gears and TH 400 trans.
It is now in a 1/2 ton after serving a decade of towing duties. Has a tunnel-ram and 2 600's on it now also and he stated it never pulled as hard as it does now.
210 PSI cranking pressure and runs 91 octane.
Many ways to go I suppose but I just never had luck at 2000 rpm.
To me that is just a horrible idea.
It is very hard on bearings to pull an engine down to 2000 rpm under a load.
Lumpy cams do not really get into a good cruise set until 500 or more rpm than what you have listed.
Yes you can get by with it but to me it would not be optimum.
I would do a much smaller grind for that RPM something like [email protected] .050 want it to lump a bit then go for a 108 or 106LSA with that duration.
For my towing stuff I like to be in the 2500 rpm minimum area and usually 2800 makes it really sweet with good power and velocity gets up a bit more through the runners and MPG does very well, better than at 2000 rpm.
But I base this on smaller engines than 460"
I did build an 11:1 396 with .060 over bore and large oval heads 2.19-1.88 valves I stuck a [email protected] .050 cam in it with 108LSA and it really is lumpy and pulls very well ..buddy had it in a 3/4 ton truck with 456 gears and TH 400 trans.
It is now in a 1/2 ton after serving a decade of towing duties. Has a tunnel-ram and 2 600's on it now also and he stated it never pulled as hard as it does now.
210 PSI cranking pressure and runs 91 octane.
Many ways to go I suppose but I just never had luck at 2000 rpm.
Tech Team
Rob
Join Date: Nov 1999
Location: Warner Robins GA.
Posts: 982
Re: Cam selection
Quote:
Originally Posted by aimhard
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Friend has a 62 Chevy PU rat rod he mainly uses to pull car trailer. It now has a 400 small block but he wants to build a big block for it. His current cruising rpm is around 2000-2100 rpm with his gearing and needs to have power in that range not to be downshifting on hills. Looking for a good lumpy cam that still has some power in that range. Engine will be a 9-1 460 with 781 heads, big valves. performer intake, and 850 Holley. He's looking at the Howards 120241-09. Any suggestion for a good sounding cam that makes power in that range?
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Tech Team
Re: Cam selection
Thanks for the reply. His heathly small block handles the duty amazingly well, considering the OD gearing.I wouldn't make the change but he is a BBC guy. Howards advertises that cam as making power from 1600. Do you think that is correct?
Tech Team
Join Date: Aug 2005
Location: KY
Posts: 922
Re: Cam selection
Quote:
Originally Posted by aimhard
View Post
Thanks for the reply. His heathly small block handles the duty amazingly well, considering the OD gearing.I wouldn't make the change but he is a BBC guy. Howards advertises that cam as making power from 1600. Do you think that is correct?
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